Manju is from the Sanskrit mañju (मञ्जु — sweet, pleasant, beautiful). Took a 14-year hiatus after marriage to actor Dileep (1998-2014, divorced 2017); returned with How Old Are You? Mother of dancer Meenakshi Dileep.
Manju does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Manju reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.